Some babies will have fever after MMR vaccination in August. It is normal that infants may develop fever within 1-2 weeks after MMR vaccination. Such fever is usually due to the reaction to vaccination and rarely exceeds 38.5°C. Most of the time, it will drop to normal within 3-5 days. During this period, babies usually have no other obvious signs and symptoms other than fever and are in good spirits. Therefore, for eight-month-old babies with fever after MMR vaccination, most of them can be relieved by drinking more water to promote metabolism, resting more and other measures, and physical cooling can also be actively carried out if the babies are able to cooperate. If the temperature exceeds 38.5℃, or if the baby has obvious symptoms of discomfort, it is necessary to consult a doctor in time, and the symptoms can be relieved by taking antipyretic drugs. If the baby is accompanied by other symptoms in addition to fever, persistent temperature, high fever and other manifestations, you need to go to the hospital for further clarification of the cause of the baby’s fever.